News

If you’ve been waiting to move to the premier dynamic modeling tool, or to extend your maintenance and upgrade to the latest version of Vensim, now is a great time. All Vensim editions are on sale, 20% off, through the … Continue reading →

We at Ventana Systems sadly mark the passing of Jay Forrester, pioneer in servomechanism control, digital computing, System Dynamics and global modeling. We hope that our tools and our work may carry on in Jay’s spirit, to help people better … Continue reading →

The latest version of Climate Interactive‘s award-winning C-ROADS climate change policy simulator, powered by Vensim, is available at https://www.climateinteractive.org/tools/c-roads/ You can run the simpler World Climate version online, in a nice browser interface:

Vensim Video Library

Vensim Causal Loop Diagramming This video shows several ways to build causal loop diagrams in Vensim. We start simple with Vensim PLE, and then illustrate some additional features, like navigation links, that are possible in DSS. The first ten minutes should have you up & running on the basics.
https://vimeo.com/179249938

Collaboration in Ventity This page is moving. Visit us at Ventity.biz!
This video takes a look at opportunities for team model building in Ventity. Ventity has a modular structure, with each entity and dataset in a separate XML file. That makes it practical to use source control systems (like subversion or git) or sync software (like Dropbox or OneDrive) ...

Model Analysis – World Dynamics This video walks through a critique of the World model that kicked off the Limits to Growth debate, starting with Forrester’s World Dynamics, followed by World3 and the Limits to Growth and many subsequent works.
The purpose of this video is not to discuss the mapping of the world models to the real world, though that ...

Ventity Introduction with Infection Models This page is moving. Visit us at Ventity.biz!
We were very pleased with our Ventity workshop at the SD conference in Delft. We had a good crowd, with interesting questions and lots of potential applications that will benefit from our new approach.
This series of videos walks you through most of the workshop content. The workshop models ...

Getting Started with Ventity – Help System Models This page is moving. Visit us at Ventity.biz!
These videos walk you through the basic Ventity models in the Help system:
https://vimeo.com/134983029
https://vimeo.com/134983416
https://vimeo.com/135000662

Vensim’s new partner – VentityThis page is moving. Visit us at Ventity.biz!
At the System Dynamics Conference in Delft, we showed a complementary new product – Ventity – that solves some problems that can be intractable in most simulation languages. Here’s a quick preview:
http://vimeo.com/vensim/ventitypreview
There’s a Ventity poster and more detailed white paper in the conference proceedings:
Ventity Poster ISDC 2014
Entity-Based System ...